PlzNavigate: support the WebRequest API

content/browser/frame_host/navigation_handle_impl.h

Index: content/browser/frame_host/navigation_handle_impl.h
diff --git a/content/browser/frame_host/navigation_handle_impl.h b/content/browser/frame_host/navigation_handle_impl.h
index c28761be683878d90f79c8c5cbcb610a75461cd0..7e51f50818a97b68a3efced064978718a7413686 100644
--- a/content/browser/frame_host/navigation_handle_impl.h
+++ b/content/browser/frame_host/navigation_handle_impl.h
@@ -28,6 +28,7 @@ struct FrameHostMsg_DidCommitProvisionalLoad_Params;
 
 namespace content {
 
+class NavigationUIData;
 class NavigatorDelegate;
 class ResourceRequestBodyImpl;
 class ServiceWorkerContextWrapper;
@@ -272,6 +273,10 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // Called when the navigation is transferred to a different renderer.
   void Transfer();
 
+  NavigationUIData* navigation_ui_data() const {
+    return navigation_ui_data_.get();
+  }
+
  private:
   friend class NavigationHandleImplTest;
 
@@ -385,9 +390,13 @@ class CONTENT_EXPORT NavigationHandleImpl : public NavigationHandle {
   // corresponding ServiceWorkerNetworkProvider is created in the renderer.
   std::unique_ptr<ServiceWorkerNavigationHandle> service_worker_handle_;
 
-  // Embedder data tied to this navigation.
+  // Embedder data from the IO thread tied to this navigation.
   std::unique_ptr<NavigationData> navigation_data_;
 
+  // PlzNavigate
+  // Embedder data from the UI thread tied to this navigation.
+  std::unique_ptr<NavigationUIData> navigation_ui_data_;
+
   SSLStatus ssl_status_;
 
   // The id of the URLRequest tied to this navigation.